Merge pull request #12 from krasa/fix2

#transformSelectionIn
add to classpath only what is in 'add-to-classpath' (Issue #13)
type for PluginUtil.show() (Issue #10)
bumped version to 0.2.3
updated readme
updated readme
updated readme
updated readme
updated readme
show full exception when appending to existing console
fixed several TODOs
Issue #14
check that keystroke is valid
check for null in currentPsiFileIn()
always show errors in new console
comparing Files instead Strings (bug on windows xp)
minor refactoring
comment
wrap/unwrapAction methods
check shortcut for null